Outlet Boundary Conditions

- June 27, 2022 at 11:04 am
  
  abbasallami2021
  Subscriber
  
  Hi everyone,
  Is it possible to apply a specific boundary for the temperature at outlets such as temperature gradient or convective boundary condition in the fluent? How can we force this boundary to the outlet section if UDF is possible?
  Regards
- June 27, 2022 at 1:03 pm
  
  Rob
  Ansys Employee
  
  Why do you want to fix the temperature drop between the inlet and outlet? The reason we simulate "stuff" is to find out what happens.
- June 27, 2022 at 2:55 pm
  
  abbasallami2021
  Subscriber
  
  In fact, Ansys-fluent uses zero-gradient condition for energy equation at the outlet. I have a special case and I want to implement different boundaries at the outlet for the energy equation.
- June 28, 2022 at 7:35 am
  
  abbasallami2021
  Subscriber
  
  Is there any way to apply a scaled temperature gradient at the outlet using UDF?
  
  Regards
  A.
- June 28, 2022 at 11:04 am
  
  Rob
  Ansys Employee
  
  You can use DEFINE_PROFILE to adjust the back flow temperature. Otherwise flow leaves the domain so temperature is irrelevent?
- June 28, 2022 at 2:58 pm
  
  abbasallami2021
  Subscriber
  
  This back flow temperature is used if there is back flow, otherwise it won't be used. As I said the boundary at this location set to zero gradient by fluent to solve the energy equation. I think there must be some way to make the diffusion coefficient non-zero.

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